Emdeon has replaced CEO George Lazenby with former Oracle executive Neil de Crescenzo.
Lazenby will become a senior adviser to private equity firm Blackstone Capital Partners, the majority investor in the Nashville-based vendor of technology for revenue cycle and payment management and clinical information exchange.
Crescenzo, 52, joined Oracle in 2006 and since 2008 had been senior VP and general manager of the company's health sciences division.